from pyexecplugins.pyexecplugins import PyExecPlugin
import tempfile
import json
import logging
import subprocess
from subprocess import PIPE

class Plugin(PyExecPlugin):
    name = "Packer"
    
    taskdef = {
        "name" : "pypacker",
        "retryCount" : 0,
        "description" : "Executes packer.io command line for build and validate. It has been isolated in order to be able to start the worker only where OS dependencies are matched.",
        "inputKeys" : ["command", "template"],
        "outputKeys" : ["results"],
        "ownerEmail" : "m.lettere@gmail.com"
    }
    
    def __init__(self, data=None):
        super().__init__(data)
        self.template = data["template"]
        self.command = data.get("command", "build")
        self.extra_vars = data.get("extra_vars", {})

    def execute(self):
        fp = tempfile.NamedTemporaryFile(mode="w", delete=False, encoding='utf-8')
        logging.getLogger("pyexec").debug("Going to %s template %s", self.command, self.data)
        json.dump(self.template, fp)
        fp.close()
        cmd = ["packer", self.command ]

        for k in self.extra_vars:
            cmd.append("-var")
            cmd.append(k + "=" + self.extra_vars.get(k))

        cmd.append(fp.name)
        logging.getLogger("pyexec").debug("Packer command is %s", cmd)

        try:
            completed = subprocess.run(cmd, capture_output=True, text=True)
        except Exception as e:
            completed = subprocess.run(cmd, stdout=PIPE, stderr=PIPE)

        logging.getLogger("pyexec").debug("Packer outcome is %s", completed)

        if(completed.returncode != 0):
            raise Exception("packer.io failed: {} - out:{} - err:{}".format(
                completed.returncode, 
                completed.stdout if completed.stdout != None else "", 
                completed.stderr if completed.stderr != None else "")
            )
        return {
            'results' : [
                {
                    'returncode' : completed.returncode, 
                    'stdout' : str(completed.stdout), 
                    'stderr': str(completed.stderr)
                }
            ]
        }